Obviously YMMV, but that's just my experience with risk tiers.
We ended up switching to a merchant bank that was better for online transactions. Cynergy ultimately released the funds as three different disbursements after we closed our account and decided to charge us account activity fees for those three months as well. It was frustrating to say the least.
Your merchant account has a limit. When you're about to blow it out of the water, you pick up the phone and call your merchant and talk about it, not wait for everything to go into automatic investigation fraud hell.
There are no flawless , fire and forget payment solutions that scale to any amount out there, there are just too many variables.
From what I understand they have tiers for assessing risk level, if you're not approved for a higher tier and try to cross the threshold your account will be flagged and cut off automatically until they can investigate/approve.